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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a855238c55d567215e130ac95267c0c2dec838314e683bdba267b7e05a5cfe7f' 
  AND token = 'loRwbdT2Ce6j5k+rnEiFLgQEtjNBCXnA+1FYoAyglfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}